I have an excel that produces a ton of these kinds of charts from my traffic data, and thought this one might be interesting.

It is looking at which parts of my portfolio are self-sustaining.
The blue representing renewal costs, and the red, parking income.

Japanese .coms as you can see just about hold their own

Russian and Arabic dot coms also look promising

Russian dot nets have always produced good traffic

and despite me having a proper sexy collection of top tier dot jps, they produce little revenue

while the numbers may be missing from the charts, the scale is accurate - so an interesting observation for example, is that I have roughly the same number of chinese & arabic domains, yet the revenue gap between the two is considerable.
Likewise Russian dot nets vs Arabic dot nets